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refactor: simplify leading zero detection

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재욱 2026-02-08 22:15:17 +09:00
parent b9ffbe8dc6
commit a6c87105dc
1 changed files with 5 additions and 7 deletions
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12
include/fast_float/ascii_number.h
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@ -356,6 +356,7 @@ parse_number_string(UC const *p, UC const *pend,
uint64_t i = 0; // an unsigned int avoids signed overflows (which are bad)
int64_t digit_count = 0;
UC const *first_digit_ptr = nullptr;
while (p != pend) {
if (has_separator && *p == separator) {
@ -365,6 +366,9 @@ parse_number_string(UC const *p, UC const *pend,
if (!is_integer(*p)) {
break;
}
if (digit_count == 0) {
first_digit_ptr = p;
}
// a multiplication by 10 is cheaper than an arbitrary integer
// multiplication
i = 10 * i +
@ -381,13 +385,7 @@ parse_number_string(UC const *p, UC const *pend,
if (digit_count == 0) {
return report_parse_error<UC>(p, parse_error::no_digits_in_integer_part);
}
UC const *first_digit = start_digits;
while (first_digit != end_of_integer_part && has_separator &&
*first_digit == separator) {
++first_digit;
}
if (first_digit != end_of_integer_part && *first_digit == UC('0') &&
digit_count > 1) {
if (digit_count > 1 && *first_digit_ptr == UC('0')) {
return report_parse_error<UC>(start_digits,
parse_error::leading_zeros_in_integer_part);
}